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Towards Achieving Keyword Search over Dynamic Encrypted Cloud Data with Symmetric-Key Based Verification

机译:通过基于对称密钥的验证实现动态加密云数据的关键字搜索

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摘要

Verifiable Searchable Symmetric Encryption, as an important cloud security technique, allows users to retrieve the encrypted data from the cloud through keywords and verify the validity of the returned results. Dynamic update for cloud data is one of the most common and fundamental requirements for data owners in such schemes. To the best of our knowledge, the existing verifiable SSE schemes supporting data dynamic update are all based on asymmetric-key cryptography verification, which involves time-consuming operations. The overhead of verification may become a significant burden due to the sheer amount of cloud data. Therefore, how to achieve keyword search over dynamic encrypted cloud data with efficient verification is a critical unsolved problem. To address this problem, we explore achieving keyword search over dynamic encrypted cloud data with symmetric-key based verification and propose a practical scheme in this paper. In order to support the efficient verification of dynamic data, we design a novel Accumulative Authentication Tag (AAT) based on the symmetric-key cryptography to generate an authentication tag for each keyword. Benefiting from the accumulation property of our designed AAT, the authentication tag can be conveniently updated when dynamic operations on cloud data occur. In order to achieve efficient data update, we design a new secure index composed by a search table ST based on the orthogonal list and a verification list VL containing AATs. Owing to the connectivity and the flexibility of ST, the update efficiency can be significantly improved. The security analysis and the performance evaluation results show that the proposed scheme is secure and efficient.
机译:可验证可搜索的对称加密,作为一个重要的云安全技术,允许用户通过关键字从云中检索加密数据,并验证返回结果的有效性。云数据的动态更新是此类方案中数据所有者最常见和最基本的要求之一。据我们所知,支持数据动态更新的现有可验证的SSE方案都基于非对称密钥加密验证,这涉及耗时的操作。由于云数据量庞大,验证的开销可能成为一个重大负担。因此,如何通过有效验证实现动态加密云数据的关键字搜索是一个关键的未解决问题。为了解决这个问题,我们通过基于对称关键的验证来探索通过动态加密的云数据实现关键字搜索,并提出了本文的实用方案。为了支持动态数据的有效验证,我们根据对称密钥加密设计一种新颖的累积认证标签(AAT),以为每个关键字生成身份验证标记。受益于我们所设计的AAT的累积属性,当发生云数据的动态操作时,可以方便地更新身份验证标签。为了实现高效的数据更新,我们设计了基于正交列表的搜索表St组成的新安全索引,以及包含AATS的验证列表VL。由于ST的连通性和灵活性,可以显着提高更新效率。安全分析和绩效评估结果表明,拟议的计划是安全和有效的。

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